J Korean Acad Pediatr Dent.  2020 Feb;47(1):36-43. 10.5933/JKAPD.2020.47.1.36.

Analysis of Primary Molar Relationship using Digital Photograph

  • 1Department of Pediatric Dentistry, College of Dentistry, Yonsei University
  • 2Yonsei Well Dental Clinic


The aim of this study was to assess the occlusal relationships of primary dentition of Korean preschool children in Hwaseong city.
Total 444 children of age group between 2 and 5 years were selected. One pediatric dentist took intraoral photos of children. Evaluation and categorization of the primary molar relationships were done by single examiner. Statistical analysis was performed with Pearson chi-squared test.
Total 389 samples, which is consisted of 185 boys, 204 girls were satisfied with inclusion criteria. Bilateral mesial step was seen in 61.7%. Bilateral flush terminal plane was seen in 15.4%. When the primary molar relations of the right and left sides were not the same, the combination of the mesial step and flush terminal plane was 14.7%.
The present study provides insight into occlusal relationships in the primary dentition of 2 - 5 years old of Korean children in Hwaseong city. Pediatric dentists should understand occlusal relationships of primary dentition for establishment of appropriate treatment strategies and occlusal guidance.

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